税務署に問い合わせたらいいと思うけど、国外資産は申請が必要なだけで、賃貸による収入が生じているのでなければ課税対象にもならないので、課税額には変更はないはずです。よってペナルティはないのでは?
またこれによると、不動産をすべて申告しなければならないわけではなく、単に自分のプライベート用のもの(personal-user property)であれば申告は不要のように思います。不安ならアカウンタントに聞いてみてはどうでしょうか?
↓これは海外資産を他人から譲り受けた場合の話ですが、資産として申告が必要かどうかは同じと思うので。
https://turbotax.intuit.ca/tips/declaring-inherited-overseas-property-6225
Exceptions to Reporting
There are exceptions to what properties you must declare. If you inherited property used solely for business purposes, it does not have to be reported.
In addition, property that you use for your personal benefit, including real estate, does not need to be declared.
For example, suppose Aunt Kay leaves you the European villa where you and your spouse have vacationed in the past. You both enjoy the place, intend to retain ownership and spend future vacations there.
The CRA considers this “personal-use property” and you don’t have to declare ownership. If you rent the property and earn rental income, however, this does have to be reported. As Gauvin clarifies, “If the asset inherited is left abroad and is earning income, you are required to report the income earned in the same fashion as Canadian source income, after converting it to Canadian dollars.”